134 REporRT OF THE BOTANICAL DEPARTMENT OF THE 
is unquestionably true that bugs are more easily controlled when 
the poison is used with bordeaux. 
The expense account included the following items: 
748 lbs.;copper sulphates “A-SC. 2.050... ea $43.38 
580°“: Lime. (@:. aaatih aes Fees eee ee 5.10 
58 white ‘arsénic'(@ 4u3-307 09). ak oS ee ee 227% 
T18¢.™ “sal” soda “(a c1Cee Wee ce re 1.18 
112 hrs, labor, for Aan ta TSC. seas Oe ee eee 16.80 
70\.°°. labor for team atscay ete ek ee eee 11.85 
Wear. von .Sprayorcnces sect pti oo Set ae one ae 5.60 
Ot ree eae ee FREAD PRONE brite Bie epee at Fn $86.62 
The total cost of spraying was $5.41 per acre or 7714 cents per 
acre for each application. 
Mr. Brainerd reports that up to August 7 there were no signs 
of late blight. By August 16 the unsprayed rows were considerably 
blighted and there were traces of the disease on the sprayed rows 
also. The unsprayed rows were practically dead by September 1 
while the sprayed rows remained green until frost which occurred 
on the night of September 13. Mr. Brainerd holds that the actual 
benefit from spraying is greater than experiments of this kind show. 
Small quantities of spray drift onto the unsprayed rows and fur- 
nish some protection against blight, so that they remain green longer 
than the unsprayed fields in the same locality. According to our 
observations this is usually the case and we believe that Mr 
Brainerd’s opinion is a correct one. 
The test rows were dug and weighed on October 4 with the 
following results: 
Second sprayed row on the west, 217 lbs. marketable tubers. 
Second sprayed row on the east, 217 !bs. maketable tubers. 
Average for the two sprayed rows, 217 lbs. marketable tubers. 
Middle unsprayed row, 153 lbs. marketable tubers. 
Yield, sprayed, 225 bu. 2 lbs. marketable tubers per acre. 
Vieid, unsprayed, 157 bu. 40 lbs. marketable tubers per acre. 
Gain, 67 bu. 22 lbs. marketable tubers her acre. 
Spraying increased the yield of marketable tubers 42.7 per ct. 
The yield of culls was 24 bu. 22 lbs. per acre for the sprayed and 
43 bu. 33 lbs. per acre for the unsprayed making a difference of 
19.bu. 11 lbs, per: acre in. favor of the unsprayed. 
There was practically no loss from rot either on the sprayed or 
the unsprayed. 
